Sol-Gel Preparation, Synthesis and Characterization of Nano Structured Cu2+ Doped Ni-Zn Ferrite Material

Recently, Nano material ferrites have applications in making cores of high frequency transformers, coils, chokes, permanent magnets, magneto optical displays, microwave absorbers, high density information storage, color imaging etc. In the present investigation, nano spinel ferrite Ni0.6Cu0.2Zn0.2Fe2O4 were prepared by sol gel auto combustion method. The synthesized sample annealed with different temperatures such as as prepared, 400 degrees C and 700 degrees C for two hours and they are characterized by XRD, SEM, TEM, Raman spectroscopy, Electric, Dielectric and Magnetic properties. The XRD analysis confirms the phase formation of prepared ferrite material and crystallinity increases as temperature increases. Structural images reveal that crystalline size is in the range of 27 nm to 35 nm. Optical properties were studied by Raman spectra which confirms mixed spine! nature of prepared ferrite materials. Raman analysis shows, Cu2+ doping effect on the tilt and stretching phonon modes of Ni0.6Cu0.2Zn0.2Fe2O4. The electric resistivity decreases as temperature enhances, which is analogous with Arrhenius relation. The dielectric properties such as dielectric constant and dielectric loss are explained on the basis of hoping mechanism. The decrement of room temperature magnetization value is observed from the M-H curve measured using VSM. Thus, the optical and magnetic properties were significantly influenced by Cu2+ doping and can be tuned for functional device applications.